JP4059593B2 - Metal tube container for extrusion with inner wall covered with resin - Google Patents

Description

【００６６】
【表２】

【００６７】
【図面の簡単な説明】
【図１】図１で統括される態様は本発明の好適実施態様を例示する押出用金属製チューブ容器において、その胴部内壁に被装された樹脂層が裾部端に向けて増厚された態様の模式的縦断面図である。図１(Ａ)は胴部内壁に熱可塑性樹脂層だけが被装された態様を示し、図１(Ｂ)は胴部内壁の任意個所に熱硬化性樹脂の樹脂基層が被装され、その表面上に熱可塑性樹脂の連続層が被装されている態様である。
【図２】図２で統括される態様は本発明の好適実施態様を例示する押出用金属製チューブ容器の模式的縦断面図であって、容器の胴部内壁に樹脂層が被装されると共に、裾部増厚を例示する。図２(Ａ)は熱硬化性樹脂からなる樹脂基層が容器の胴部内壁を口頚部下端まで被装し、その表面上に熱可塑性樹脂層がチューブ容器の胴部内壁を殆ど被装すると共に、その裾部内壁において樹脂層が増厚された態様を示し、図２(Ｂ)はチューブの金属層に被装された熱硬化性樹脂層が胴部内壁の略肩部下端まで被装され、その表面に熱可塑性樹脂層が胴部内壁を殆ど被装すると共に、その裾部内壁において裾部端向けに樹脂層が増厚された態様を示す。
【図３】図３は本発明の各好適実施態様で好適に使用される静電粉体塗装方法を実施する為に好適な静電粉体塗装装置の１例を示す模式的縦断面図である。
【符号の説明】
７ 素材金属製チューブ(容器としては未完成)
８ 口頚部の上端開口
１０ 押出用金属製チューブ容器
１１ 押出用金属製チューブ容器の裾部
１２ 単一樹脂層、複合(重層)樹脂層
２１ 電界形成用電極
２２ 粉体塗料噴出ノズル
２５ チューブホルダー
７a 胴部(肩部から裾部端までを言い、口頚部を除く)
７m キャップを冠装螺合する為のネジ山
７n 口頚部
７s 肩部
１１i 裾部内壁
１１v 裾部端開口
１１z 裾部端(尾端)
１２b 熱硬化性樹脂からなる樹脂基層
１２p 熱可塑性樹脂からなる樹脂保護層
７ai 胴部内壁
７nx 口頚部外壁
７si 肩部内壁
AIL 接着阻止層
ASL 接着付与層
CST 螺縞型
TST 虎縞型[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a metal tube container for extrusion having an inner wall covered with a resin coating, which can protect the contents so as not to come into contact with the outside world even when the metal layer is perforated or broken. And a combination of one or more resin layers coated on the inner wall. More specifically, the present invention is a semi-paste-like drug, hair styling agent, hair dye, cosmetics, food, taste or adhesive, sealing agent.TheThe present invention relates to a metal tube container for extrusion suitable as a container for storing, transporting (transporting) and storing. In the present invention, “for extrusion” means “used for use by extruding the contents”.
[0002]
[Prior art]
  Conventionally, metal tube containers for extrusion have been widely used as containers for containing semi-paste-like contents such as ointments, toothpastes, hair dyes and other high-viscosity substances listed above. In this container, after the contents are loaded from the bottom end opening (tail end opening), the contents are transferred to the outside oxygen, carbon dioxide, and / or moisture by sealing the bottom end opening, for example, by folding. Keep the contents away from touching.
[0003]
  In addition to being excellent in shape retention, storage stability, transportability, portability, etc., such metal tube containers for extrusion have little inhalation of outside air after extrusion and minimize contact between the contents and outside air. It has the advantage of being limited. For example, in Japanese Utility Model Laid-Open No. 59-16850, a light metal material such as aluminum or an aluminum alloy is generally used as a base material constituting the above-described extruded metal tube container, and in some cases, a metal material such as tin. Is adopted. The inner wall is formed (covered) with a coating (coating) layer having corrosion resistance so that corrosive contents can be accommodated. In order to form a coating layer of a thermosetting resin with adhesion to metal as a coating film having corrosion resistance, conventionally, a liquid thermosetting resin such as an epoxy resin or an epoxy-phenolic resin should be coated. Spraying onto the substrate surface followed by baking.
[0004]
  As an improvement of the inner surface resin-coated metal tube container, a double tube in which a resin tube is fitted inside a metal tube has already been used. However, this type of double tube increases the cost due to an increase in the number of processes for internally fitting the resin tube, and the contents inside the tube due to the difficulty in extracting the contents due to the internally fitted resin tube. There was a problem of increased persistence. Further, as another problem, when the content decomposes during storage to generate a gaseous material, for example, when the content is hydrogen peroxide or the like, the internal pressure of the resin tube caused by oxygen gas generated by the decomposition There was also a risk that the ascent would eventually rupture.
[0005]
[Problems to be solved by the invention]
  However, if this type of container is filled with a hair dye or the like that generates gas with the passage of storage time as the contents, the hem (hem edge) is sealed (sealed) after filling. ) To secure a gas passage for removing gas (internal gas) generated at a later date, and after degassing the internal gas from this gas passage, mechanically seal the hem end opening by fastening, etc. Measures are being taken.
[0006]
  For this purpose, since it is necessary to perform a sealing process so that the deaeration passage opens naturally as necessary at a later date, it is necessary to cover a resin coating having a sufficient thickness as a coating layer. is there. However, it has been difficult to ensure a sufficient thickness for the coating layer. In addition, in the case of the type of contents that generate internal gas, the internal pressure still increases after sealing, and eventually tries to push through the seal (sealing) at the hem end (tail end). As a result, when the seal at the skirt end is not sufficiently durable, there is also a problem that the liquid is leaked and the content liquid leaks out.
[0007]
  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an extrusion metal tube container capable of sealing the bottom end opening of the extrusion metal tube container so as to avoid an increase in internal pressure due to leakage of internal gas. It is said.
[0008]
[Means for Solving the Problems]
  The metal tube container for extrusion according to the present invention, which has been developed to achieve the above object, achieves the desired effect by being defined by the following various constituent requirements:
(1) An extrusion metal tube in which one or more types of resin layers are coated on the inner wall of the metal tube, and the resin skin layer coated on the inner wall of the metal tube is the inner wall of the metal layer A thermoplastic resin layer that can be adhered to the metal layer, and the metal layer and the resin layer are at least partially adhered to each other;TheThe tail end region of the thermoplastic resin layer is increased,By folding and sealing the tail end region where the thermoplastic resin layer is layered thickly without heat sealingA metal tube container for extrusion in which the thermoplastic resin layer protects the contents against the outside, or an inner wall of the metal layer is at least partially covered with a thermosetting resin having adhesion to metal, and the thermosetting resin A thermoplastic resin layer that is difficult to adhere to the thermosetting resin layer is laminated on the surface of the layer so that the tail end region of the thermoplastic resin layer is thickened.By sealing the tail end region where the thermoplastic resin layer is layered thickly without being heat sealed,A metal tube container for extrusion that protects the contents against the outside world.
(2) After the hem of the metal tube is tightened, sealing is performed by means that does not cause interlayer fusion between the resin layer and one or more resin layers that are covered on the inner wall of the hem. The metal tube container for extrusion as set forth in (1), wherein internal gas can leak out from the sealing portion.
(3) The inner wall of the metal tube is covered with a thermosetting resin layer that adheres to the metal over a range adjacent to the mouth and neck from the skirt, and the inside of the mouth and neck of the metal tube. (1) to (2) fixed to the inner wall of the metal tube by covering the metal layer with a thermoplastic resin layer that is difficult to adhere to the thermosetting resin layer and that can be adhered to the metal layer. The metal tube container for extrusion as described.
(4) On the inner wall of the metal tube, in addition to being covered with a thermosetting resin layer that is adhesive to metal over the range adjacent to the shoulder from the skirt, The shoulder and mouth and neck inner walls are difficult to adhere to the thermosetting resin layer, and the metal layer is covered with an adhesive thermoplastic resin layer, thereby being fixed to the inner wall of the metal tube. The metal tube container for extrusion according to any one of (1) to (3).
(5) A metal tube container for extrusion, wherein the metal forming the metal tube is composed of one or more metals selected from the group consisting of aluminum, tin and zinc, an aluminum alloy, a tin alloy and a zinc alloy A phenol-formaldehyde resin as a thermosetting resin having adhesiveness to metal, which is one or more alloys selected from the group consisting of the metal tube and is coated from the inner wall of the metal tube to at least the inner wall of the body. One or more resin layers selected from cresol-formaldehyde resin, epoxy resin, polyamideimide resin, melamine resin, urea resin, and urethane resin are located, and as a thermoplastic resin further formed on the surface, a polyethylene resin, Is it a group consisting of polypropylene resin, polyester resin and ethylene-propylene thermoplastic elastomer? Extruded metal tube container according to any one of the one or more resin layers selected are formed over the trunk portion inner wall of at least the mouth and neck inner wall (1) to 4.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the present specification, “up and down, left and right, front and rear, front back” and the like are expressions for convenience of explanation.
  A preferred embodiment of the present invention generally illustrated in FIG. 1 will be described. FIG. 1 is a schematic longitudinal sectional view showing a preferred embodiment example of a metal tube container for extrusion (sometimes simply referred to as “tube container”) used in the present invention. In this extruded metal tube container 10, the cylindrical body portion 7 a is formed of a thin metal foil, usually an aluminum foil, and a cap (not fixed) is formed on the outer wall 7 nx of the neck portion 7 n located at the upper end of the body portion 7 a. A thread 7m is formed for crown-mounting the screw (shown). Further, the upper end opening 8 at the upper end of the mouth / neck portion 7n is closed with a cap made of the same metal as that of the body portion 7a, for example, an aluminum cap or a resin cap. The closing mode of the upper end opening 8 is selected so as to correspond to each of two types of specifications that are the shape (model) of the opening, that is, the nipple specification or the membrane specification.
[0010]
  On the other hand, in the inner wall of the tube container 10, the end of the bottom 11, that is, the opening (bottom end opening; tail end opening) 11 v located at the bottom end 11 z is still open. In the specification of the present invention, the term “inner layer” or “skin layer” means, for example, the side close to the contents in the tube container 10 or the side close to the major axis of the container, and “upper and lower”, “ “Left and right”, “front-rear”, “front and rear” and the like are expressions for convenience of explanation.
[0011]
  The present invention shown in FIG.The preferred embodiment isIn the tube container 10, the inner wall 7ai of the trunk portion 7a is covered with a single kind of resin layer 12 made of a thermoplastic resin, and is different from the present invention shown in FIG.The preferred embodiment isThe resin layer covering the inner wall of the tube container 10 is a composite (multilayer) resin layer 12, which is a thermosetting resin layer 12 b (also referred to as “resin base layer 12 b”) made of a thermosetting resin having adhesion to metal. In this embodiment, a thermoplastic resin layer 12p (also referred to as a resin protective layer 12p) made of a thermoplastic resin is laminated on the surface.
[0012]
  the aboveThe thermoplastic resin layer 12 in FIG. 1 (A) can be bonded sufficiently firmly to the surface of the metal layer.IfAn example will be described. In this example, the thermoplastic resin layer 12 in FIG. 1A serves as both the resin base layer 12b and the resin protective layer 12p, and at least the inner wall 7in of the neck portion of the tube container 10 and the inner wall 7si of the shoulder portion 7s. And it is sufficient if it is firmly fixed to at least one selected from one or more locations on the inner wall 7ai. Rather, it is preferable that the thermoplastic resin layer 12 is not fixed to the whole body inner wall 7ai (partially free). That is, on the inner wall 7ai of the body portion, the thermoplastic resin layer (formed with a thermoplastic resin cylinder or a thermoplastic resin bag) 12 is only partially fixed, and it is easy to use that it is widely separated. On the contrary, it is preferable. The reason is that even when the body portion 7a is broken or broken by an external force applied thereto, the built-in thermoplastic resin layer 12 is not easily accompanied by the tear or break, and the contents are still removed from the outside. It is to be expected to protect in a substantially insulated state.
[0013]
  Various types shown in Fig. 1 (A)To the aspectVarious fixing modes of the thermoplastic resin layer 12 to the body inner wall 7ai can be adopted including a mode in which the thermoplastic resin layer 12 is fixed to the mouth neck inner wall 7ni and the shoulder inner wall 7si. For example, the thermoplastic resin layer 12 has sufficient adhesion to the metal layer that forms the barrel inner wall 7ai.In caseIn order to form an “adhesion inhibition zone” in which the thermoplastic resin layer 12 is not adhered to a predetermined portion of the body inner wall 7ai, it is sufficiently adhered to the body inner wall 7ai as an “adhesion inhibitor”. For example, the resin may be separated from the metal layer by a treatment such as application of a substance that hardly adheres to the resin or affixing an adhesive film formed of the substance. Here, for example, an application of an adhesion inhibitor, or an application film formed with an adhesion inhibitor (adhesion prevention film; adhesion prevention layer; abbreviated as “AIL”) or the like is applied to small sections (spots), strips, and the like. A mode of covering (applying or sticking etc.) in an appropriate range and shape in an appropriate place can be given in the form of a band (belt or zone) or a combination thereof. As the adhesion inhibitor, for example, a wax-like material or a grease-like material made of an oil-repellent material such as silicon wax (organopolysiloxanes) is practical.
[0014]
  Among the fixing modes described above, the practical ones are the “tiger stripe type” (TST) mode in which a plurality of strips of silicon wax or the like are formed on the inner wall 7ai of the trunk portion so as to be substantially perpendicular to the generatrix and the trunk portion 7a. A “spiral type” (CST) mode in which a strip of silicon wax or the like is spirally formed around the long axis X is easy in actual application operation.
  In addition, the placement of the “adhesion prevention strip” in the above example, that is, the position, width, mutual spacing, etc., can be selected as appropriate.
However, it is usually sufficient to provide a relatively wide adhesion-inhibiting strip on the inner wall 7ai with a relatively large interval, and three strips 40mm in width on the inner wall 7ai having a length of about 200mm. Is attached to the position close to the shoulder portion 7s and the substantially middle position of the trunk portion 7a, and it is sufficient as a “tiger stripe type” (TST). Here, it is important for the manifestation of the effect of the present invention that the thermoplastic resin layer 12 is free from the inner wall 7ai of the body portion 7a after the middle stage and the skirt portion 11 subsequent thereto. That is, this area is an area in which the body portion 7a is easily deformed by pressure welding or severe bending as the contents are squeezed out and easily breaks or breaks. If the thermoplastic resin layer 12 is free from the barrel portion 7a, the thermoplastic resin layer 12 is free from the barrel inner wall 7ai even if the barrel portion 7a is broken or broken. In addition, the inner cylinder or the inner bag is less likely to be affected by breakage or tearing, and the contents are still formed from the thermoplastic resin layer 12 in an insulated state from the breakage of the body portion 7a. Protected in a bag.
[0015]
  Each of the above represented in FIG.The aspect isIn any case, the case where the thermoplastic resin has sufficient adhesiveness on the metal layer forming the inner wall 7ai of the body portion 7a is described as an example. However, on the contrary, the thermoplastic resin has almost no adhesion to the metal layer.In caseEven in the case where the adhesion-imparting layer (abbreviated as “ASL”) made of a material having sufficient adhesion to both the metal layer and the thermoplastic resin layer 12 is used for forming the above-described adhesion prevention region. For example, it can be appropriately applied in the same form as a small section (spot), a strip (belt or zone), or a combination thereof. Among them, “Tiger stripe type” (TST) and / or “Spiral stripe type” (CST) are applied to the appropriate places on the metal layer surface as described above, and the heat of the continuous layer is covered so as to cover each place. Of course, a mode in which the plastic resin layer 12 is covered is included in various modes typified by FIG. 1A as a preferred mode of the present invention. That is, even in this aspect, it is included in the configuration of the present invention described above, and the effects of the present invention can be exhibited.
[0016]
  The adhesion-imparting layer (ASL) does not stay between the metal surface and the thermoplastic resin layer 12, and may be used between the resin protective layer 12p and the resin base layer 12b as shown in FIG. Can be. The above-mentioned adhesion blocking layer (AIL) and adhesion-imparting layer (ASL) are not limited to the purpose of completely losing adhesion (non-attachment) and the purpose of realizing strong adhesion (adhesion), respectively. It can also be used for the purpose of adjusting the strength of the skin, for the purpose of limiting their effects to a desired area, and the like.
[0017]
  As an adhesion inhibitor that can be used in the preferred embodiment typically illustrated in FIG. 1A, a thermosetting resin can be used instead of the exemplified silicon wax. The reason for this is that the thermosetting resin with adhesion to metal does not exhibit adhesion to thermoplastic resins such as polyolefin (resin), and conversely, resin that generally exhibits sufficient adhesion to metal layers. It is required to be.
[0018]
  Each of theseIn aspectPreferably utilizes the fact that the thermoplastic resin layer forming the resin protective layer 12p is “almost non-adhesive” to the resin base layer 12b made of a thermosetting resin having adhesion to metal. However, the meaning of “almost no adhesiveness” does not exclude “temporarily”. That is, in the stationary state, both layers form a dense layer, but even if the layers are close enough to be easily peeled off by applying a large external force, they are “temporarily attached” here. Included in that.
[0019]
  Another preferred embodiment of the present invention typically shown in FIG.Example embodiments are:As the resin base layer (acting as an adhesion preventing layer here) 12b, the resin base layer 12b made of a thermosetting resin having adhesion to metal is formed on at least the skirt inner wall 11i of the body inner wall 7ai of the metal tube container 10 for extrusion. Resin protective layer with metal adhesion (provided sufficient adhesion to the metal layer) on the surface covered with the above-mentioned "spiral type" in the range extending over the shoulder inner wall 7si (excluding the mouth and neck) An embodiment in which 12p is coated as a continuous layer is shown. The average layer thickness of the resin base layer 12b is usually 3 to 10 μm, and preferably 5 to 8 μm.
[0020]
  The present inventionA preferred embodiment typically shown in FIG.In aspectIs directly covered with a resin layer 12 made of a thermoplastic resin having adhesiveness to the metal layer on the inner wall 7ai side of the body tube wall 10 of a metal tube container 10 made of aluminum or the like. The preferred embodiment shown in FIG.In aspectIn the tube container 10, first, a resin base layer 12 b made of a thermosetting resin layer having adhesion to metal is formed on the inner wall 7 ai of the body portion 7 a, and after curing, the surface is adhesive to the resin base layer 12 b. By forming the resin protective layer 12p made of a thermoplastic resin layer that is difficult to perform, even when the metal layer of the tube container is broken or torn, the contents are still sufficiently protected from the outside in an insulated state. The resulting composite (multilayer) resin layer 12 can also be created.
[0021]
  Each of the aboveThe aspect isThe case where the thermoplastic resin has sufficient adhesiveness to the metal body inner wall 7ai is described as an example. However, on the contrary, the thermoplastic resin has almost no adhesion to the metal layer.In caseEven in such a case, an adhesive strip made of a mediating material (adhesion-imparting agent) having sufficient adhesion to both the metal layer and the thermoplastic resin layer 12 is covered with an appropriate portion as described above on the surface of the metal layer. Of course, a mode in which the thermoplastic resin layer 12 as a continuous layer is covered so as to cover the respective portions is also included in the modes of FIGS. 1 (A) and 1 (B) of the present invention. That is, theseIn aspectEven if it exists, it is because the effect of this invention can be expressed. Of course, the material that forms the adhesive strip in the embodiment of FIGS. 1 (A) and 1 (B) may be a thermosetting resin as long as it has sufficient adhesion to the thermoplastic resin. . In the present invention, when polyolefin (resin) is used among resins frequently used as thermoplastic resins, the adhesion to metal is generally less than the required level. This polyolefin (resin) can be used in the form of, for example, polyethylene (resin), polypropylene (resin), ethylene-propylene copolymer resin, propylene-ethylene copolymer resin, two or more kinds of these compositions (mixtures), and the like. However, they generally lack metal adhesion.
[0022]
  Examples of the adhesion-imparting agent that imparts adhesiveness to the thermoplastic resin layer having poor or lacking adhesion to metal include unsaturated organic acids and derivatives thereof, such as maleic acid, itaconic acid, citraconic acid, Examples of mezaconic acid, tetrahydrophthalic acid or norbornene dicarboxylic acid and acid derivatives include maleic anhydride, itaconic anhydride, citraconic anhydride, mezaconic anhydride, tetrahydrophthalic anhydride or norbornene dicarboxylic anhydride. be able to. Of these, maleic anhydride is most preferred.
[0023]
<Increase hem>
  FIG.In a preferred embodiment of the present invention controlled byFigure 1 ( A )Is a single type of resin in which the inner wall 7ai of the body portion 10 of the metal tube 10 is made of a thermoplastic resin (examples of classification numbers “(3) -1 to (3) -4” in Table 1). A mode of being covered by the layer 12,FIG. ( B )In the embodiment example (classification numbers “(4) -1 to (4) -4” in Table 1), the resin layer 12 covered on the body inner wall 7ai of the metal tube 10 is a composite. (Polymerization) A resin layer, which is made of a thermoplastic resin on the surface of a resin base layer 12b made of a thermosetting resin.resinIn each of the modes in which the protective layer 12p is overlaid, the resin protective layer 12p is a mode in which the thickness is increased from the skirt inner wall 11i to the skirt end 11z.
[0024]
  FIG.In the preferred embodiment of the present invention shown in (B) (classification number “(4) -1 to (4) -4”), the area near the bottom end opening 11v on the inner wall of the metal tube container 10 for extrusion, In the skirt inner wall 11i area, the thickness of the resin protective layer 12p is other area, that is, the body inner wall.7 ai InIt is formed sufficiently thicker (thickening) than the layer thickness of the thermoplastic resin layer 12 in the area covered with the metal base resin base layer 12b.
[0025]
  FIG.The detailed structure of the tube of the present invention shown in (A) is described in the following Table 1 (classification numbers “(3) -1 to (3) -4”) together with its variations.
  The significance of this hem thickening is that it can normally block the entry of outside air even if this part is not interlayer fusion sealed, e.g. heat sealing, and the gas and / or vapor generated from the contents by storage. When the pressure (internal pressure) due to the pressure exceeds a predetermined value, the flow passage is opened by the pressure to leak the generated gas, and after the internal pressure is restored, the flow passage can be naturally blocked. There is to make it.
[0026]
  Here, if the coated area of the thickened resin protective layer 12p is a standard size tube (length: 200 mm × outer diameter: 25 mm) as an example, the skirt inner wall 11i to the shoulder inner wall 7si side is usually 15-30 mm. In the embodiment of the present invention, an area of about 20 mm is sufficient. If the thickness of the resin protective layer 12p on the body inner wall 7ai is usually 20 to 200 μm, the average overall layer thickness range of the thermoplastic resin (protective) layer in the thickened area is, for example, an upper limit of 600 μm or less, preferably Is set to 10 to 300 μm, it is sufficient in many cases. In addition, this thickening area isFIG.As shown in FIG. 4, it is an area used for a fastening seal of the hem portion 11 at a later time. The average layer thickness range (layer thickness of the resin base layer 12b + layer thickness of the resin protective layer 12p) of the skirt (thickened portion) 11 is usually 1.5 to 30 times the average body (resin) layer thickness of 20 to 200 μm. Enough for most purposesIntendedThe effect of.
[0027]
  Thus, as a means for forming a sufficiently thick resin single layer (which serves as both a base layer and a protective layer) 12 or a resin protective layer 12p, for example, electrostatic coating using a powder coating material of a thermoplastic resin is suitable. By adopting such a coating means, it is possible to form a sufficiently thick coating film in a much shorter time (high speed) than coating by solvent type paint that has been generally performed conventionally, It is not necessary to build a closed system necessary to prevent the volatilized organic solvent from leaking into the outside air. This closed system is generally a large-scale facility and has the problem of being unacceptable for small-scale implementation with small capital.
[0028]
  In a preferred embodiment of the present invention, for example, by increasing the thickness of the resin layer in a specific area extending from the skirt inner wall 11i to the mouth neck inner wall 7ni side (partial increase), for example, this area. After performing degassing from the above and sealing the seal, it is possible to expect a positive sealing effect against the intrusion of the outside air, and gas and / or steam generated inside the tube container 10 from this area, It can be expected to be discharged (leaked).
[0029]
  In addition, by adopting the above-described skirt thickening, for example, simultaneously with the operation of forming the resin layer 12 on the barrel inner wall 7ai of the tube container 10 without increasing the special sealing process, it is continued or separately. In addition, the bottom (tail end) 11 can be sealed.
  It is an example of the present invention.FIG. ( A )In (Category No. (3) -1), a thermoplastic resin (adhesive to metal) having sufficient adhesion to the metal layer on the inner wall 7ai side of the body tube wall 10 of a metal tube container 10 such as aluminum. The resin layer 12 made of is directly covered. In addition,FIG.In (A) (classification number (3) -1), as long as the thermoplastic resin layer 12 located on the skirt inner wall 11i is thickened, the most part of the surface is adhered to the body inner wall 7ai. Is also within the scope of the present invention, and an aspect in which the entire surface is adhered is also located in the outer edge region of the scope of the present invention.
[0030]
  FIG. ( B )In a different preferred example (classification number (4) -1) typically shown in Fig. 1, first, a resin base layer 12b made of a thermosetting resin layer having adhesion to metal is formed on the barrel inner wall 7ai in the tube container 10. By forming a resin protective layer 12p made of a thermoplastic resin layer that is difficult to adhere to the resin base layer 12b on the surface after the curing, even when the body portion 7a is broken or torn, It is also possible to create a composite (multilayer) resin layer 12 that can still protect the contents in an insulated state.
[0031]
  FIG. ( B )The detailed configuration of the tube container 10 of the present invention shown as a representative in FIG.
  AboveFIG. ( B )In the preferred embodiment example (classification numbers “(4) -1, (4) -3 and (4) -4”) representatively shown in FIG. 4, the thermoplastic resin is sufficiently adhered to the metal inner wall 7ai. This is described as an example. However, conversely, even when the thermoplastic resin has almost no adhesion to the metal layer (classification number (4) -2), it is sufficient for both the metal layer and the thermoplastic resin layer 12. Attaching an adhesive layer (ASL) made of a mediating material having a good adhesive property to the appropriate location as described above on the surface of the inner wall 7ai of the metal barrel in the form of an adhesive strip, etc., and covering each location Of course, an embodiment in which the thermoplastic resin layer 12 as a continuous layer is coated on theFIG. ( A ) And FIG. ( B )It is included by the aspect of this. That is, even these embodiments are included in the above-described configuration of the present invention, and the effects of the present invention can be exhibited. thisFIG. ( A ) And FIG. ( B )Of course, what forms the adhesive strip in the embodiment may be a thermosetting resin having sufficient adhesiveness to the thermoplastic resin layer.
[0032]
[0034]
[0035]
[0036]
[0037]
[0038]
[0039]
[0040]
[0041]
<Fixing the inner wall of the neck and / or shoulder>
  FIG.In a preferred embodiment of the present invention controlled byFIG. ( A ) And FIG. ( B )Is an example showing yet another embodiment. here,FIG. ( A ) And FIG. ( B )Each representatively shown inAspectA specific region of the surface of the metal layer is necessarily coated with a resin base layer 12b made of a thermosetting resin layer having adhesion to metal, and the surface thereof has the thermosetting property. This is an improvement of the aspect in which the resin layer 12b is covered with a resin protective layer 12p made of a thermoplastic resin that is difficult to adhere.
[0042]
  FIG.Representatively shown in (A)AspectThe resin base layer 12b made of a thermosetting resin having adhesion to metal is connected to the metal layer from the bottom inner wall 11i of the body inner wall 7ai of the metal tube container 10 to the lower end of the mouth neck inner wall 7ni through the shoulder inner wall 7si. The resin base layer 12b is formed by covering in a form that adheres with sufficient strength, and a resin protective layer 12p made of a thermoplastic resin difficult to adhere to the resin base layer 12b is laminated on the surface of the resin base layer 12b. 12p is a mode in which not only it but also the inner wall 7ni of the mouth and neck is covered and firmly fixed to the inner wall 7ni.FIG.In the embodiment (A), the resin protective layer 12p is fixed only with a sufficiently large adhesive force to the mouth / neck inner wall 7ni of the tube container 10, and is only temporarily attached to the thermosetting resin layer 12b.
[0043]
  FIG.(B) RepresentativeAspectThe resin base layer 12b made of a thermosetting resin layer having an adhesive property with respect to metal, which is a resin base layer, is covered on the trunk inner wall 7ai of the metal tube 10 until it contacts the lower end of the shoulder inner wall 7si from the bottom inner wall 11i. On the surface, a resin protective layer 12p made of a thermoplastic resin layer that is hard to adhere to it is overlaid, and this resin protective layer 12p is not limited to this but also covers the shoulder inner wall 7si and the mouth neck inner wall 7ni. In this embodiment, the inner walls are bonded and fixed.
[0044]
  FIG. ( B ) In the embodiment ofThe resin protective layer 12p made of a thermoplastic resin layer is fixed only by using a sufficiently large adhesive force to the shoulder inner wall 7si of the tube container 10 and a similar adhesive force to the mouth-and-neck inner wall 7ni, and is temporarily attached to the resin base layer 12b. I'm just doing it.
[0045]
  FIG. ( A ) And FIG. ( B )According to this layering method, the inner cylinder or inner bag formed by the resin protective layer 12p can be partially peeled from the surface of the resin base layer 12b by various mechanical external forces that can be applied to the tube container 10, and the container It is not necessary to directly receive most of the effects of bending, twisting, punching, breakage, etc. due to external force applied to 10. As a result, the inner cylinder or the inner bag is generally healthy and protects the contents from coming into contact with the outside world, and it can be expected to prevent most of the situation such as an accidental leakage to the outside world. . In other words, it can be expected that the shoulder portion 7s and the mouth-neck portion 7n of the tube container 10 are the least likely to be deformed by the mechanical external force.
[0046]
  AboveAspectThe case where the thermoplastic resin layer 12 has sufficient adhesiveness on the inner wall 7ai of the metal layer forming the trunk portion 7a is described as an example. However, on the contrary, the thermoplastic resin layer 12 has almost no adhesion to the metal layer.In caseEven if it exists, the above-mentioned adhesion layer (ASL) made of a material having sufficient adhesion to both the metal layer and the thermoplastic resin layer 12 is formed on the surface of the metal layer in the form of, for example, an adhesive strip. Of course, the present invention can be applied to such appropriate locations, and each location is covered with a continuous thermoplastic resin layer.FIG. ( A ) And FIG. ( B )It is included by the aspect of this. That is, thisIn aspectEven if it exists, it is because it is included in the structure of said invention and can express the effect of this invention.
[0047]
  MoreFIG. ( A ) And FIG. ( B) Includes a mode (not shown) in which the resin protective layer 12p made of a thermoplastic resin is firmly adhered and fixed only to the shoulder inner wall 7si of the tube container 10.Is done.
[0048]
[0049]
  FIG.Each embodiment typically exemplified in (A) (Table 2According to the classification number “(9) -1 to (9) -4”), the inner tube (inner bag) made of thermoplastic resin is fixed by a sufficient adhesive force between the inner wall 7ni of the mouth and neck. At the same time, the sealing (non-interlayer fusion sealing) at the skirt 11 only causes the gas generated from the contents (inside) to be discharged out of the tube container 10 by leakage, that is, to increase the internal pressure of the tube container 10. The effect of effectively preventing the resulting burst can be enjoyed.
[0050]
  FIG. ( B )The detailed structure of the tube of the present invention shown in FIG.Table 2Are described together with variations thereof.
  FIG.Each embodiment typically exemplified in (B) (Table 2Classification number “(10) -1 to (10) -4” in the figure; where (10) is an alternative to the notation in which “10” is entered in a circle. (The same applies when a 2-digit number is entered in parentheses)), the inner tube (inner bag) made of thermoplastic resin is more stable due to the adhesive force to both the inner wall 7ni of the mouth and neck and the inner wall 7si of the shoulder. The internal pressure of the tube container 10 is increased by leaking out of the tube container 10 by a seal (non-interlayer fusion seal) that is fixed only at the skirt portion 11 of the tube container 10. The effect which prevents effectively the burst resulting from this can be enjoyed.
[0051]
  A composite (multilayer) resin layer 12 composed of a resin base layer 12b made of a thermosetting resin that is adhesive to metal and a resin protective layer 12p made of a thermoplastic resin is formed on the inner wall 7ai of the body of the metal tube container 10. In this case, when the resin protective layer 12p is simply covered on the surface of the resin base layer 12b, the resin protective layer 12p is detached (peeled) due to insufficient interlayer adhesion between the two layers.
[0052]
  As a countermeasure for preventing this detachment, the resin base layer 12b made of a thermosetting resin is coated (coated; coated) only on a necessary portion on the inner wall 7ai of the body portion according to the use of the metal tube container 10 for extrusion. ), And an inner bag-shaped container made of a resin protective layer 12p made of a thermoplastic resin can be covered so as to cover the formed resin base layer 12b for adhesion to metal. Here, the resin protective layer 12p is not partial, and is formed so as to form an inner bag-like container composed of continuous layers.
In this way, a resin protective layer made of a thermosetting resin coating partially adherent to metal in a direction substantially perpendicular to the long axis X on the body inner wall 7ai of the metal tube container 10.12pIf the resin protective layer 12p is difficult to adhere to the resin base layer 12b, a portion where the resin protective layer 12p directly adheres to the body inner wall 7ai is left to the extent necessary. The resin protective layer 12p can be prevented from completely falling off or floating (free) phenomenon.FIG.This is a desired state.
[0053]
[0054]
[0055]
[0056]
[0057]
[0058]
  In addition, when forming the composite (multilayer) resin layer 12 which consists of the resin base layer 12b and the resin protective layer 12p in the trunk | drum inner wall 7ai of the tube main body 7, if the resin protective layer 12p is covered on the surface of the resin base layer 12b, In some cases, the interlayer adhesion between the two layers may be insufficient.
  As a countermeasure against this lack of interlaminar adhesion, a thermosetting resin with adhesion to metal is coated (coated; coated) only on necessary portions on the inner wall according to the use of the metal tube container 10 for extrusion. So as to cover them on the resin base layer 12bMade of thermoplastic resin coatingAn inner bag-like container can also be covered. As this thermoplastic resin, a resin that is difficult to adhere to a thermosetting resin but can be adhered to a metal layer with sufficient strength is selected.Resin protective layer made of thermoplastic resin12p is not partial, and continuously forms an inner bag-like container. In this way, when the resin base layer 12b made of a thermosetting resin that is adhesive to metal is partially covered on the inner wall of the metal tube container 10, the resin protective layer 12p is difficult to adhere to the resin base layer 12b. In addition, the resin protective layer 12p has an appropriate amount of a portion that directly adheres to the metal tube body 7, and thus the resin protective layer 12p can be prevented from being completely dropped or lifted (released).
[0059]
  <Description of powder coating and apparatus>
  Hereinafter, preferred implementation of the present inventionExampleAn electrostatic powder coating (powder coating) apparatus that is preferably used will be described.
  As shown in FIG. 3, the body 7a of the uncovered material metal tube 7 is gripped by the tube holder 25, which is a rotatable tube support mechanism, over the entire circumference of the neck and neck. The trunk portion 7a is grounded through the tube holder 25.
[0060]
  Further, an electric field forming electrode 21 is inserted into the tube body 7a so as to be able to occupy an arbitrary position in the major axis X direction, and a potential difference (voltage) necessary for electrostatic powder coating is applied thereto. The
  Therefore, in this electrostatic powder coating apparatus, a strong electric field is formed from the electrode 21 toward the inner wall 7ai of the body metal tube 7 by applying a potential difference. In this state, when the tube holder 25 is rotated at a predetermined speed by a driving force from a motor (not shown), for example, an electric motor, the powder paint is jetted to the inner wall of the tube via the powder paint jet nozzle 22. The sprayed powder coating is immediately electrostatically attracted to the inner wall 7ai of the body and adheres uniformly. Here, the paint powder that has not adhered is recovered by a suction recovery mechanism (not shown) located downstream of the ejection direction. The collected powder coating material can be reused as an electrostatic powder coating material after its charge has been neutralized by approaching an electrode having a reverse potential or a ground electrode.
[0061]
  In order to form a coating film from the powder coating material electrostatically adsorbed on the inner wall of the tube, it is useful to retain the coating film in a heating furnace or a hot air furnace set at a predetermined temperature for a predetermined time. Here, the average temperature in the heating furnace or hot air furnace needs to be set to a temperature sufficient to melt or bake the powder coating used.
  As a suitable example as shown in FIG. 3, by using an electrostatic powder coating apparatus, a uniform resin coating containing no defects (defects) such as pinholes can be formed within a short time with a sufficient layer thickness. The metal tube container for extrusion of the present invention can be produced.
[0062]
  In the various embodiments described above, when the thermoplastic resin layer 12 has sufficient adhesion to the body inner wall 7ai of the metal tube 10, the inner wall 7ai of the body inner wall 7ai is adjusted in order to adjust the interlayer adhesion. Interlayer adhesion is imparted when the thermoplastic resin layer 12 has almost no adhesiveness with respect to the purpose of covering the predetermined portion with an adhesion blocking layer (AIL) or the body inner wall 7ai of the metal tube 10. For this purpose, if there is a purpose to attach an adhesion-giving layer (ASL) to a predetermined portion of the body inner wall 7ai, the metal tube 7 is introduced prior to introducing the material metal tube 7 into the electrostatic powder coating apparatus. 7 is presupposed to be pre-coated with an adhesion blocking layer (AIL) and / or an adhesion-imparting layer (ASL) on the inner wall 7ai of the body portion 7 and the like.
[0063]
  As a method or means for performing this preliminary coating, a spray coating method (spray coating apparatus), a roll coater (such as a gravure coater), or a brush coating method can be appropriately selected. Among these, those that are excellent from the viewpoint of productivity and the like are the spray coating method (spray coating apparatus) and the roll coater (gravure coater and the like).
  In addition, when the resin that forms the adhesion blocking layer (AIL) and / or the adhesion-imparting layer (ASL) used for preliminary coating is a thermosetting resin, the thermosetting resin layer is first heated after preliminary coating. Alternatively, the method used for the electrostatic powder coating described above is usually used at the time of curing by other curing means, while curing or after curing. For the purpose of shortening the working time, it is also possible to adopt a measure for preliminarily covering the thermosetting resin in the form of a prepolymer to shorten the time required for curing.
[0064]
【The invention's effect】
  As explained above, the metal tube container for extrusion according to the present invention has the following effects:
(1) Adhesive thermoplastic resin is applied to at least one of the inner walls selected from the neck, shoulder and trunk of the metal tube container, and the thermoplastic resin layer is applied to the other part. The freed form is less susceptible to cracks, tears or breaks occurring in the tube container, so that the contents can still be preserved without contacting the outside;
(2) At least one of the inner walls selected from the neck, shoulder and trunk of the metal tube container is coated with a thermosetting resin for adhesion to metal as a resin base layer, on which the resin base layer is applied. The mode in which the protective layer is formed in a continuous layer form with a thermoplastic resin that is difficult to adhere is less susceptible to cracks, tears or breaks occurring in the tube container, so the contents can still be preserved without contacting the outside ;
(3) The thermoplastic resin layer is partially attached to the inner wall of the metal tube container in an adhesive state, and the skirt portion is tightly sealed in an embodiment in which the vicinity of the hem end of the resin layer is particularly thick. Alone prevents the outside air from entering, and the internal pressure increase caused by internal gas generated at a later date can be eliminated by leakage from the seal;
(4) The thermoplastic resin layer coated on the resin base layer made of a thermosetting resin for adhesion to metal, which is mounted on the inner wall of the metal tube container for extrusion, hardly adheres to the resin base layer. The aspect in which the vicinity of the hem end is formed to be sufficiently thick prevents the outside air from entering even if the hem is folded and sealed, and an increase in internal pressure due to internal gas generated later can be eliminated by leakage from the seal. . Specifically, this metal tube container is useful for containing drugs, hair styling agents, hair dyes, cosmetics, foods or tastes, etc .;
( 5 )A thermosetting resin that is adhesive to the metal layer is coated as a resin base layer on at least one of the inner walls selected from the neck and shoulders of the metal tube container, and it is difficult to adhere to the resin base layer thereon. In the metal layer, the adhesive thermoplastic resin is formed from a continuous layer in the form of a protective layer and is free from the inner wall of the tube container. Because it is not easily affected, the contents can still be preserved without being in contact with the outside world.
[0065]
[Table 1]

[0066]
[Table 2]

[0067]
[Brief description of the drawings]
[FIG.]FIG.In the extruded metal tube container exemplifying a preferred embodiment of the present invention, the aspect governed by the above is a schematic longitudinal section of the aspect in which the resin layer covered on the inner wall of the body part is thickened toward the end of the bottom part. FIG.FIG.(A) shows a mode in which only the thermoplastic resin layer is covered on the inner wall of the trunk,FIG.(B) is a mode in which a resin base layer of a thermosetting resin is coated at an arbitrary position on the inner wall of the body portion, and a continuous layer of a thermoplastic resin is coated on the surface thereof.
[FIG.]FIG.Is a schematic longitudinal cross-sectional view of an extruded metal tube container illustrating a preferred embodiment of the present invention, in which a resin layer is applied to the inner wall of the body of the container and the skirt is thickened. Is illustrated.FIG.In (A), the resin base layer made of a thermosetting resin covers the inner wall of the container body to the lower end of the neck and neck, and the thermoplastic resin layer almost covers the inner wall of the tube container on its surface, In the hem inner wall, the resin layer is shown thickened,FIG.(B) is a thermosetting resin layer coated on the metal layer of the tube is coated to the substantially lower end of the shoulder portion inner wall, the thermoplastic resin layer almost covers the barrel inner wall on the surface, The aspect which the resin layer was thickened toward the skirt end in the skirt inner wall is shown.
FIG. 3 is a schematic longitudinal sectional view showing an example of an electrostatic powder coating apparatus suitable for carrying out the electrostatic powder coating method preferably used in each preferred embodiment of the present invention. is there.
[Explanation of symbols]
7 Material metal tube (unfinished as a container)
8 Opening the upper end of the neck
10 Metal tube container for extrusion
11 Extrusion metal tube container hem
12 Single resin layer, composite (multilayer) resin layer
21 Electric field forming electrode
22 Powder coating nozzle
25 Tube holder
7a Torso (from shoulder to hem, excluding mouth and neck)
Thread for screwing the 7m cap on the crown
7n mouth and neck
7s shoulder
11i hem inner wall
11v Hem end opening
11z Hem end (tail end)
12b Resin base layer made of thermosetting resin
12p Resin protective layer made of thermoplastic resin
7ai body inner wall
7nx mouth and neck outer wall
7si shoulder inner wall
AIL adhesion blocking layer
ASL adhesive layer
CST spiral type
TST tiger stripe type

Claims (5)

A metal tube for extrusion in which one or more resin layers are covered on the inner wall of the metal tube,
The resin skin layer coated on the inner wall of the metal tube is only a thermoplastic resin layer that can adhere to the inner wall of the metal layer, and the metal layer and the resin layer are at least partially adhered to each other. In addition, the tail end region of the thermoplastic resin layer is thickened, and the tail end region where the thermoplastic resin layer is layered thickly is folded and sealed without heat sealing, so that the thermoplastic resin layer is Metal tube container for extrusion that protects the contents against the outside, or
An inner wall of the metal layer is at least partially covered with a thermosetting resin having adhesion to metal, and a thermoplastic resin layer that is difficult to adhere to the thermosetting resin layer is formed on the surface of the thermosetting resin layer. The thermoplastic resin layer is layered so that the tail end region is thickened, and the tail end region where the thermoplastic resin layer is thickened is folded and sealed without heat sealing. Metal tube container for extrusion that protects against the outside world.   Even after the hem of the metal tube is tightened, one or more types of resin layers covered on the inner wall of the skirt are sealed by means that does not cause interlayer fusion with the opposing resin layers. The metal tube container for extrusion according to claim 1, wherein internal gas can leak out from the sealing portion.   The inner wall of the metal tube is covered with a thermosetting resin layer that adheres to the metal over a range adjacent to the mouth and neck from the hem, and the inside of the mouth and neck of the metal tube is thermoset. 3. The extrusion metal product according to claim 1 or 2, wherein the metal layer is fixed to the inner wall of the metal tube by being covered with a thermoplastic resin layer that is difficult to adhere to the conductive resin layer and is capable of being attached to the metal layer. Tube container.   On the inner wall of the metal tube, in addition to being covered with a thermosetting resin layer that is adhesive to metal over a range adjacent to the shoulder from the hem, the shoulder of the metal tube and It is difficult to adhere the inner wall of the neck and neck to the thermosetting resin layer, and the metal layer is fixed to the inner wall of the metal tube by being covered with an adhesive thermoplastic resin layer. 4. A metal tube container for extrusion according to any one of 3 above.   A metal tube container for extrusion, wherein the metal forming the metal tube is made of one or more metals selected from the group consisting of aluminum, tin and zinc, or a group consisting of an aluminum alloy, tin alloy and zinc alloy As a thermosetting resin for adhesion to metal that covers at least the inner wall of the body from the inner wall of the bottom of the metal tube, phenol-formaldehyde resin, cresol- One or more resin layers selected from formaldehyde resin, epoxy resin, polyamideimide resin, melamine resin, urea resin, and urethane resin are located, and as a thermoplastic resin further formed on the surface, polyethylene resin, polypropylene resin , Selected from the group consisting of polyester resins and ethylene-propylene thermoplastic elastomers Extruded metal tube container according to claim 1 which is formed over one or more of the resin layer in the body portion inside wall of at least the mouth and neck inner wall that.

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